kdd

kdd cup 2015

username , course_id 要映射成数字 enrollment_clean 保存clean后的数据，分别是 enrollment_id , username ,course_id

log_train_clean，保存clean后的结果，分别是：enrollment_id，time，source，event，object object，source，event都要映射成数字，time保存的是2000年1月1日0,0,0秒,的偏移值 source：server=1 , browser=2 event：

• . problem - Working on course assignments.
• . video - Watching course videos.
• . access - Accessing other course objects except videos and assignments.
• . wiki - Accessing the course wiki.
• . discussion - Accessing the course forum.
• . navigate - Navigating to other part of the course.
• . page_close – Closing the web page.